Organise imports using isort --profile black

nummi/main/migrations/0001_initial.py

@@ -1,12 +1,13 @@
 # Generated by Django 4.0.4 on 2022-05-22 07:45
 
 import datetime
-import django.core.validators
-from django.db import migrations, models
-import django.db.models.deletion
 import re
 import uuid
 
+import django.core.validators
+import django.db.models.deletion
+from django.db import migrations, models
+
 
 class Migration(migrations.Migration):
 

nummi/main/migrations/0006_alter_category_options_alter_invoice_options_and_more.py

@@ -1,9 +1,10 @@
 # Generated by Django 4.1.4 on 2022-12-20 14:26
 
 import datetime
+
 import django.core.validators
-from django.db import migrations, models
 import django.db.models.deletion
+from django.db import migrations, models
 
 
 class Migration(migrations.Migration):

nummi/main/migrations/0007_snapshot_file_alter_invoice_file_alter_snapshot_date.py

@@ -1,6 +1,7 @@
 # Generated by Django 4.1.4 on 2022-12-21 08:53
 
 import datetime
+
 import django.core.validators
 from django.db import migrations, models